Boretrinn

Boretrinn is a term used in Norwegian drilling and geotechnical contexts to describe a discrete depth interval or step within a borehole. It denotes a defined segment of the borehole, typically specified by its upper and lower depth bounds, and used for organizing measurements, sampling, or construction activities.

In practice, a boretrinn may correspond to a change in rock or soil type, a variation in drilling conditions, or a shift in casing or grout requirements. The concept helps to structure borehole logs, sampling plans, and installation sequences by providing clear, repeatable depth-based divisions. Data collected within each boretrinn—such as geological descriptions, geotechnical properties, or sampling results—are often recorded in tabular form to support interpretation and reporting.

The use of boretrinn varies by organization and project, and terminology may differ in international contexts. In Norwegian documentation, it is common to describe boreholes in terms of these depth intervals to facilitate communication among engineers, drill crews, and analysts. When translated or used in broader contexts, the concept may be referred to as a depth interval, section, or interval, depending on regional practices.

Etymology follows from the Norwegian words bore (drill) and trinn (step), reflecting the idea of advancing the borehole in steps. See also borehole, well logging, and geotechnical investigation for related topics.